Rock-drill.



Patented Dec. 30, |902. J. H. REDFIELD.

B 0 G K D R l L L. (Application med Nov. 1901.)

3 Sheets-Sham I.

(No Mams.)

Lpyzgor by l we wams Persrgs co. Pwomumq, wsmnsmn, n. c.

No. 7I7,027. yPatented Dec. 30, |902. J. H. REDFI'ELD.

ROCK DRILL.

. (Application med Nov. 9, 1901.?

(No Model.) 3 Sheets-Sheet 2.

l l a Zlargzys No. 717,027. Patented Dec. 30, |902.

J. H. BEDFIELD.

ROCK DRILL.

(Application led Nov. 9, 1901.) (No Model.) 3 Shets-$hpet -3.

summit Q0* il P Tins tu, vuofaumo.. wAsNINcToN o c Nrrnn Sterns ATENTOFFICE.

JOHN HILL REDFIELD, OF SPOKANE, VASHINGTON, ASSIGNOR OF ONE- HALF TOCHARLES GRUTT, EMIL GRUTT, AND FRED GRUTT, OF

sossnune, WASHINGTON.

ROCK-DRILL.

SPECIFXCATION forming part of Letters Patent No. 717,027, dated December30, 1902.

Application filed November 9, 1901. Serial No. 81,724. KNO model.)

To all whom, it may concern:

Be it known that I, JOHN HILL REDFIELD, a citizen of the United States,residing at Spokane, in the county of Spokane and State of Washington,have invented a new and useful Rock-Drill, of which the following isaspeci- Vlication.

My invention relates to certain improvements in drilling-machines ofthat class ernployed in mining, quarrying, tunneling, and similaroperations, and has for its object to improve, simplify, and cheapen theconstruction of such machines.

A further object of the invention is to provide an improved mechanismfor automatically revolving the drill at the end of each stroke and,further, to provide an automatic means for gradually feeding the drillto its work, the mechanism being of such character that it will onlyfeed when the drill is properly working and will cease feeding if thedrill stops cutting.

Further objects of the invention are to provide an improved form ofoperating-cam for reciprocating the drill-shaft and to provide a chuckof improved construction which will permit of the removal of thedrill-bit from the side of the chuck.

Further objects and advantages of the invention will be apparent from areading of the description.

In the accompanying drawings, Figure 1 is a side elevation of adrilling-machine constructed in accordance with my invention. Fig. 2 isa transverse sectional elevation of the same. Fig. 3 is an elevation ofthe :rear end of the machine. Fig. 4 is an elevation of the front end ofthe machine, a portion of the figure being in section on the line 4 4 ofFig. 2. Fig. 5 is a sectional plan view of a portion of the machine onthe line 5 of Fig. 2. Fig. 6 is a transverse sectional elevation on theline 6' 6 of Fig. 7, illustrating the construction of the mechanism forrevolvingthe drill-shaft. Fig. 7 is a sectional elevation on the line 77 of Fig. 6. Fig. 8 is a detail sectional view on the line 8 S of Fig.9, illustrating the automatic feeding mechanism. Fig. 9 is a sectionalelevation of the same on the line 9 9 of Fig. S. Fig. l0 is an endelevation of a portion of said mechanism, illustrating the automaticdisconnection of the ratchetoperating pawl when the crank-handle isapplied. Fig. 11 is a transverse sectional elevation of thedrill-holding chuck. Fig. 12 is a perspective view of the cam andcam-shaft detached. Fig. 13 is a detail sectional View of thecarriage-clamp employed for supporting the drill in position for work.Fig. 14 is a detail sectional View illustrating the bufferring on theline 14 14 of Fig. 2.

Similar numerals of reference are employed to designatecorrespondingparts throughout the several figures of the drawings.

15 designates the main drill-frame, and 16 a supporting-carriage onwhich said frame is longitudinally adjustable, the carrier beingprovided with dovetail guides 17 for the reception ofcorrespondingly-shaped side pieces l 1S on the drill-frame.

Extending transversely through the frame and adapted to suitablebearings therein'is a cam-shaft 19, carrying two cams 20, of a.construction moreparticularly described hereinafter, and at the oppositeends of the shaft, at points outside the frame, are secured ilywheels21, said wheels being held to the shaft by tapered locking screws 22,adapted to threaded openings formed partly in the shaft and partly inthe hubs of the ily-wheels. The heads 22 ofthe screws are provided withtransverse openings,through which may pass an operating-bar 23 forconvenience in tightening the screw, the end of said bar after thescrewis tightened being turned into alinement with the shaft and seatedin any one of a number of openings or recesses 24, arranged on the outerend of the hub of the fly-wheel. This arrangement will positively lockthe Iiy-wheels to the shaft and prevent any displacement while themachine is in operation. On the shaft 19 is also secured a pinion 25,which interineshes with a gear-wheel 26, mounted on a primary shaft 27,the latter being driven by power from a suitable motor or being revolvedby hand through the agency of handlecranks 2S. In order to provide forthe easy running of both the primary and cam shafts,

'Io the front end of the frame is bolted a tu bular buffer-head 31,havinga bushing 32, of bronze or a similar metal, the. end of thebushing being provided with an enlarged annular flange 33, seated withinan enlarged opening in the inner end of the buffer-head. The opening inthe buffer-head is partly filled with a yielding packing 34, on which isplaced a buffer-ring 35, the latter being held in position by aspring-ring 36, adapted to an annular groove in the periphery of thebufferring and in frictional contact with the inner wall of thebuifer-head. This ring is adapted to receive and the packing to' absorbthe shock or jar resulting from the outward movement of the drill-shaftunder the impulse of the actuating-spring 37, the shaft being providedwith an enlarged flange 38 for contact with the buer-ring. The oppositeend of the shaft finds a bearing in an adjustable box 40, provided witha suitable bushing 4l,said box being provided with diametricallydisposedside lugs 42,adapted to suitable guiding-openings 43 in the sides of theframe. At a point adjacent to the cam-shaft the drillshaft 30 has afixed collar 44, adapted for contact with the cams, and between saidcollar and theinner ends of the box 40 the cornpression-spring 37 isarranged. In order to adjust the tension of the spring to alter the blowof the drill in accordance with the character of the work being done, Iemploy a yoke-shaped lever 45, pivoted at 46 to the opposite sides ofthe frame, the opposite ends of said yoke being adapted to engage therear faces of the lugs 42. To this lever is secured an operating-lever47, arranged at one side of the frame, the intermediate portion of saidlever being adapted to engage with a series of ratchet-teeth 48, formedon the side of the main frame for the purpose of locking said lever inposition. The lever is attached to the yoke-shaped member by a bolt 50in such manner that it is free to play laterally, a second bolt 5l,passing through said lever and secured in the yoke member, beingprovided with a compression-spring 54, which tends to hold said lever inengagement with the locking-teeth. f An auxiliary bar or lever may beinserted in the opening 55, arranged at the upper. central portion ofthe yoke member to assist in the adjustment of the spring, it beingunderstood that the closerthe box 40 is moved to .the collar 44 theharder will be the blow of the drill-bit.

In the box 40 are arranged two ratchet-v wheels 60 6l, through which thedrill-shaft passes, and said ratchet-Wheels are held from turning in onedirection by spring-pressed pawls 62, guided in suitable openings formedin the lugs 42 at the sides of the box. The springs 64 are seated inrecesses in suitable plates 65, secured to the outer endsof the lugs forconvenience in assembling the parts. In the periphery of shaft 30 areformed two grooves 67 68, the groove 67 being kparallel with the lengthof the shaft and adapted to receive a feather or spline 69, projectinginwardly from the ratchet-wheel 60, the ratchetwheel turning with theshaft and preventing any movement in a reverse direction. The groove 68extends helically on the shaft, its opposite ends being at about ninetydegrees from each other. This groove is adapted to receive an inclinedfeather or spline 70, projecting inwardly from the ratchet-wheel 6l, sothat when the drill-shaft is moved to the rear by the operating-cams theratchet-Wheel will be turned by the engagement of the feather andinclined groove, the wheel being locked in its new position by theengaging pawls. On the inward movement of the drillshaft against thestress of the actuatingspring 37 the drill-shaft will be revolved ashort distance and locked in position by the ratchet-wheel 60 and itspawls.

In order to provide for a long and powerful stroke of the .drill withouta corresponding increase inthe radial projection of the operating-cams,I have constructed a cam-shaft and cams of the structure more clearlyshown in Fig. 12. The shaft 19 is provided with two enlarged iianges 7l,forming shoulders which bear against the side frames to prevent anylongitudinal displacement of said shaft. The central portion of theshaft is recessed, as at 72, to permit of the closer approach of thecollar 44 to the center of the shaft. The cams 20 are provided withcurved operatingfaces 73 and radial faces 74, the operatingfaces 73having their starting-point at or within the circumferential line of theshaft and vpreferably at about the center of rotation of such shaft. Iam thus enabled to procure a cam in which the action will be easy andgradual and at the same time to lengthen the stroke of the cam withoutundue increase in the degree of radial projection.

The drill-frame, as previously described, is mounted in a carriage 16,and in said carriage is a fixed nut 80, through which passes anadjusting-screw 8l. The outer end of the adjusting-screw is adapted toaibearing in a lug 82, forming part of the drill-frame, and is held fromlongitudinal movement independent of the frame by a fixed collar 83,carried by the screw at one side of the lug, and a ratchet-wheel 84,secured to the screw on the opposite side of said lug. The extreme endof the screw-spindle is rectangular or polygonal in form and adapted forthe reception of the socket end 85 of a cranked wrench 86, Which may beapplied to the screw when it is desired to reverse the movement of thedrill-frame or to adjust the latter to working position when thedrilling is started. On the hub of the ratchet-wheel is loosely mounteda cup 87, which extends over the periphery, of the ratchet-wheel, asuitable cover-plate IOO IIO

88 being mounted on the hub of the wheel at the opposite side of theratchet-teeth and secured to the cup by screws 89 90. At one side of thecup is a recess 91, in which is situated a pawl 92, mounted on the screw89 and normally pressed into engagement with the` ratchet-teeth by asmall compression-spring 93. At a point outside the cup the coverplateis provided with a lever 94, pivoted at 95 and having its opposite endbent at a right angle and passing through a curved slot 96 in thecover-plate to a point within the cup. The central portion of the leverlies close to the rectangular orpolygonal end of the screwspindle, andits free end is normally in contact with that side of the pawl 92opposite the compression-spring 93. The function of this lever is toautomatically disengage the pawl from the teeth of the ratchet-Wheelwhen the socket end 85 of the wrench is placed on the end of thescrew-spindle, the end of the socket member being inclined and acting asa cam to force the lever to one side while the wrench is being placed inposition.

100 represents a bar having a cranked end. portion 101 in the path ofmovement of the collar 44, the vertical portion of said bar being incontact with and partly guided by an inclined arm 102, which acts tomove the cranked end of the bar from contact with the collar before thelatter has reached the full limit of its rearward movement. The oppositeend of the bar is secured toa depending lug 103 of a cam-plate 104, asecond lug 105 on said cam-plate being provided with a suitableguiding-opening for said bar. The camplate extends partly over the cup87 and is provided with an inclined slot or cam 106 for the reception ofa pin 107, projecting from said cup. The bar is surrounded by a helicalspring 108, secured at one end to the lug 82 and at its opposite end tothe bar, said spring acting both as a torsion and compression spring,its torsional stress keeping the vertical portion of the bar in contactwith the inclined face 102 and its longitudinal stress acting to returnsaid bar and cam-plate to the forward position after each rearwardthrust by the collar 44. The operation of this portion of the mechanismwill be readily understood. At each rearward movement of'the collar 44under the action of the cams 20 the bar 101 will be moved to the rear,causing the inclined slot of the cam-plate to effect a rotatablemovement of the cup 87 through the medium of the pin 107. This movementcauses the engaging pawl 92 to move the ratchet-wheel and thescrew-spindle for an angular distance equal to the length of one or moreteeth. The rearward movement of the bar, however, is not the same asthat of the collar 44, the inclined face of the arm 1 02 causing thecranked end ofthe arm to move beyond the periphery of the collar and tobe disengaged therefrom before the collar reaches the limit of itsrearward movement. The compression -spring 108 then re turns the bar toits initial position in readiness for the return of the collar, and whenthe latter has finally reached its full forward position the torsionalaction of the spring causes the cranked end 101 of the bar to again moveinto the path of the collar.

In drills of this class as ordinarily constructed the drill-frame mustbe moved rearwardly on its carriage to disengage the drillchuck from thebit, and in order to avoid this undesirable feature I employ a chuck ofthe character more clearly shown in Figs. 1 and 11.

The rear end of the chuck 109 is secured by screw-threads or in anyother suitable manner to the end of the drill-shaft. The forward end ofthe chuck is provided with a socket 110 for engagement with the shank ortang of -the drill, and the side of said socket is open, so that thedrill may be moved laterally. To confine bit in place, I employ aclamping-jaw 111, having a threaded shank 112, passing through asuitable guiding-opening in the body of the chuck, a nut 113 beingplaced on said threaded shank to draw the clamping-jaw tightly againstthe shank of the bit, and thus coniine the latter Within thereceiving-socket.

The drill-carriage is so supported as to be capable of movement at anyangle, and for this purpose I form on the carriage a circular boss 114,having inclined walls and adapted to be received within asimilarlyshaped socket or seat 116, formed in a joint member 117, thetwo parts being confined together in any position of circumferentialadjustment by a-securing-bolt 118. The clamping member 117 issubstantially right angle in contour, the seat or socket 116 beingformed in one of its arms and the outer face of the opposite arm beingprovided with a circular boss 119, having inclined walls, and the rearface of this member being provided with a socket 120 for the receptionof the head of a bolt 121, which serves to secure said member in a seator socket 122, formed in one member of a two-part clamp 123, adapted tobe secured on the ordinary supporting-bar by which the drill is heldinWorking position. This universal joint permits of the adjustment of thedrill at any desired angle and at the same time is useful in that itpermits of a tilting or sidewise movement ot' the drill carriage andframe to turn the latter to one side or the other in order to removelong drills out of deep holes without the necessity of reversing thefeeding-screw, as is usually the case.

Although the construction herein described, and illustrated in theaccompanying draw ings, is the preferred form of the machine, it isobvious that many changes in the form, proportions, size, and minordetail of construction may be made without departing from the spirit orsacrificing any of the advantages of my invention.

Having thus described my invention, what l claim is- IOO IIO

j l. The combination with a drill-shaft having a xed collar, of acam-shaft recessed intermediate of its length to permit the passage ofsaid collar, and a cam mounted on said shaft and having anoperating-face extending approximately from the axis of rotation of saidshaft.

2. The combination with a drill-shaft having a fixed collar, of acam-shaft having in one of its sides a recess to permit the approach ofthe periphery of the collar to a point adjacent to the center ofrotation of the shaft, a pair of actuating-cams mounted on the shaft ateach side of the recess, said cams each having a curved operating-faceand a straight radial face, the curved face extending approximately fromthe center of'rotation of the shaft, and the radial face beingsubstantially in alinement with the recess of the cam-shaft,substantially as speciiied.

3. The combination with a' drill-rod and means for reciprocating thesame, of a guiding-box for said drill-rod, a supporting-frame for thedrill-rod and the box, a pivoted yoke carried by the frame and adaptedfor contact with said box, an operating-handle on said yoke, and aseries of ratchet-teeth for holding said handlein an adjusted position,substantially as specified.

4. The combination with a frame having side slots or openings, of adrill rod or shaft carried thereby, a box or casing adapted for thesupport of the inner end of the drill-rod, opposite guiding-lugs formedon said box or casing and projecting through said side slots oropenings, a compression-spring surrounding the drill-shaft and havingone end bearing against said box or casing, a pivoted yoke having itsends in operative contact with said lugs, an operating-lever carried bysaid yoke and movable laterally with respect to the yoke, a springtending to keep the lever and yoke in contact, and a series ofratchet-teeth adapted to engage said lever and hold the same in anadjusted position, substantially as specified.

5. The combination with a frame having side slots or openings, of ardrill-shaft, a box or casing adapted for the support of the inner endsof the drill-shaft, opposite guiding lugs formed on said box or casingand projecting through said side slots or openings, ratchet-Wheelscarried by the box or casing and-adapted for operative engagement Withthe drill-shaft to effect the rotation of said drill-shaft,locking-pawls guided in suitable openings in said lugs and engaging`with the ratchet-Wheels, removable end plates formed on said lugs, andpawl-springs adapted to recessed seats in said plates, substantially asspecified. v

6. The combination in a drill,of the carriage, a xed nut carriedthereby, the drill-frame, a drill-shaft carried thereby, a fixed collarcarried by said drill-shaft, a screw carried by the frame and adapted tothe said nut, a

ratchet-Wheel secured to said screw, a cup or casing surrounding saidratchet-wheel, a pawl carried by said cup or casing for engagement Withthe ratchet-wheel, a longitudinally-movable bar or plate having aninclined slot adapted to receive a pin projecting from the cup, andmeans for connecting the drill-shaft to said bar or plate, substantiallyas specified.

7. A feed mechanism for a drill, comprising a fixed nut, a screWinengagement therewith, a ratchet-wheel secured to the screw, a cup orcasing surrounding the ratchet-Wheel and guided on theA hubV thereof, apawl carried by the cup or casing and engaging said ratchet-wheel, aradially-projecting pin on said cup or casing, a slotted cam-platemovable independently of the drill-frame and engaging said projectingpin, means for positively moving said cam-plate in one direction, and aspring` for effecting the movement of the cam-plate in the oppositedirection.

8. The combination of the carriage, a fixed nut carried thereby', aframe, a drill-shaftsupported by the frame, means for reciprocating saidshaft, a fixed collar carried by the shaft, a screw carried by the frameand' adapted to engage said nut, a ratchet-Wheel carried by the screw, acup or casing Asurrounding said ratchet-Wheel, a pawl carried by the cupor casing and engaging said ratchet-Wheel, a radially-projecting pin onsaid cup or casing, a longitudinally-movable bar or plate having aninclined slot for the reception of said pin, a crankedl arm carryingsaid bar or plate and having one of its ends normally in the path ofmovement of the xed collar of the drillshaft, an inclined arm adapted to.act on said cranked bar, and a combined torsion and compression springcarried by said bar, substantially as specified.

9. The combination of the drill-shaft having a fixed limit of movement,a collar xed to said drill-shaft, a feed-screw, a ratchet- Wheel securedthereto, a cup or casing surrounding the ratchet-wheel, a pawl carriedby said cup or casing and engaging said ratchet- Wheel, aradially-projecting pin on said cup or casing,a longitudinally-movablecam-plate having a slot for engagement with said pin, a bar operativelyconnected to the cam-plate and having one end disposed in the path ofmovement of the collar of the drill-shaft and mechanism for disengagingsaid operatingbar from the collar before the latter has reached itslimit of rearward movement, substantially' as specified.

10. T he combination of the feed-screw having a rectangular or polygonalend, aratchet- Wheel secured to said feed-screw, a cup or casingsurrounding said ratchet-Wheel, a pawl carried by said cup or casing andadapted to engage the ratchet-wheel, and a pivoted lever carried by thecup or casing and having one vof its ends in position to engage saidpawl, said lever having an intermediate portion in proximity to therectangular end of the feedscrew and adapted to be engaged by the socketend of a hand-tool to eect the disengage- IOO IIO

drill, a bolt having a threaded end and an enlarged head for engagingthe drill-shank, and a nut for looking said bolt in position,substantially as specified.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of tWo Witnesses.

J OI-IN HILL REDFIELD.

Witnesses:

N. T. JOHNSON, l?. M. ELLsWoRTH.

